Rudolf Hoernes (7 October 1850 – 20 August 1912) was an Austrian geologist, born in Vienna, son of Moritz Hoernes. He studied under Eduard Suess and became a Professor of geology in Graz. He was known for his earthquake studies in 1878 and proposed a classification of earthquakes into subsidence earthquakes, volcanic earthquakes and tectonic earthquakes. In 1893, he published a detailed textbook on earthquake theory (Erdbebenkunde) from a geological point of view.

Rudolf Hoernes
Born(1850-10-07)7 October 1850
Died20 August 1912(1912-08-20) (aged 61)
NationalityAustrian
Scientific career
FieldsGeology
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